I was enjoying just having myself falling into the deep dark.
She looked like so happy,
but just having fun falling down herself into the deep darkness
はまた違った意味、ニュアンスになりますので
深い闇に落ちていく自分自身を楽しんでいるだけだったという時は
I was enjoying just having myself falling into the deep dark.
で通じます
日本 
